# Transforms tag and field values as well as measurement, tag and field names with regex pattern
[[processors.regex]]
  namepass = ["nginx_requests"]

  ## Tag value conversion(s). Multiple instances are allowed.
  [[processors.regex.tags]]
    ## Tag(s) to process with optional glob expressions such as '*'.
    key = "resp_code"
    ## Regular expression to match the tag value. If the value doesn't
    ## match the tag is ignored.
    pattern = "^(\\d)\\d\\d$"
    ## Replacement expression defining the value of the target tag. You can
    ## use regexp groups or named groups e.g. ${1} references the first group.
    replacement = "${1}xx"
    ## Name of the target tag defaulting to 'key' if not specified.
    ## In case of wildcards being used in `key` the currently processed
    ## tag-name is used as target.
    # result_key = "method"
    ## Appends the replacement to the target tag instead of overwriting it when
    ## set to true.
    # append = false

  ## Field value conversion(s). Multiple instances are allowed.
  [[processors.regex.fields]]
    ## Field(s) to process with optional glob expressions such as '*'.
    key = "request"
    ## Regular expression to match the field value. If the value doesn't
    ## match or the field doesn't contain a string the field is ignored.
    pattern = "^/api(?P<method>/[\\w/]+)\\S*"
    ## Replacement expression defining the value of the target field. You can
    ## use regexp groups or named groups e.g. ${method} references the group
    ## named "method".
    replacement = "${method}"
    ## Name of the target field defaulting to 'key' if not specified.
    ## In case of wildcards being used in `key` the currently processed
    ## field-name is used as target.
    # result_key = "method"

  ## Rename metric fields
  [[processors.regex.field_rename]]
    ## Regular expression to match on the field name
    pattern = "^search_(\\w+)d$"
    ## Replacement expression defining the name of the new field
    replacement = "${1}"
    ## If the new field name already exists, you can either "overwrite" the
    ## existing one with the value of the renamed field OR you can "keep"
    ## both the existing and source field.
    # result_key = "keep"

  ## Rename metric tags
  [[processors.regex.tag_rename]]
    ## Regular expression to match on a tag name
    pattern = "^search_(\\w+)d$"
    ## Replacement expression defining the name of the new tag
    replacement = "${1}"
    ## If the new tag name already exists, you can either "overwrite" the
    ## existing one with the value of the renamed tag OR you can "keep"
    ## both the existing and source tag.
    # result_key = "keep"

  ## Rename metrics
  [[processors.regex.metric_rename]]
    ## Regular expression to match on an metric name
    pattern = "^search_(\\w+)d$"
    ## Replacement expression defining the new name of the metric
    replacement = "${1}"